Contents:
[PATCH 1/2] Make clean() use cleanup():
Currently, clean() contains duplicate code from cleanup().
This patch makes clean() reuse cleanup(), for consistency.
This is also required to make patch 2 work.
Sent separately since it makes sense to merge this patch even if the
second one is rejected.
[PATCH 2/2] Add default_cleanup_srcdir
Makes `cleanup srcdir` call cleanup_srcdir, which, by default, calls
default_cleanup_srcdir.
This allows APKBUILDs to override cleanup_srcdir (e.g for the new
module system go has), and reuse default_cleanup_srcdir.
This is preferable to always using chmod, or always checking for go,
when most packages are not affected.